ADS Environmental Services ADS TRITON+ QR 775027 A3 - Manual (Page 370)

Maintenance and Troubleshooting 10-49
Problem Individual UpDepth_1 values consistently read -9.99.
Possible
Causes
Sensor may be faulty.
5-volt fuse on regulator may be blown.
Possible
Solutions
Replace the Peak Combo Sensor.
Replace the 5-volt blue fuse (when replaceable) on the
regulator.
Caution: Do not connect a questionable sensor to
another monitor before verifying the integrity of the
sensor. A shorted sensor will blow the 5-volt (blue)
replacement fuse on the regulator in the monitor.